Faulty fuel injector on cylinder 3 with high internal resistance or a stuck pintle; Damaged or corroded wiring harness connector at the cylinder 3 injector; Open or shorted injector driver circuit in the engine wiring harness; Failed injector driver inside the PCM (less common but possible); Poor electrical ground connection shared by the injector circuit; Contamination or debris in the fuel rail affecting injector performance; Aftermarket or incorrect injector installed on cylinder 3 with mismatched specifications

DTC codes / P2Bxx · Hybrid propulsion / P2B02

P2B02Cylinder 3 Injection Pulse Performance

Q: What does code P2B02 mean?

Cylinder 3 Injection Pulse Performance. P2B02 indicates that the powertrain control module (PCM) has detected an abnormal injector pulse performance for cylinder 3, meaning the electrical signal sent to the fuel injector did not produce the expected current or voltage response. The PCM monitors the injector circuit for opens, shorts, or excessive resistance and sets this code when the pulse width or current draw falls outside the expected range for the commanded injection event.

P2B02 indicates that the powertrain control module (PCM) has detected an abnormal injector pulse performance for cylinder 3, meaning the electrical signal sent to the fuel injector did not produce the expected current or voltage response. The PCM monitors the injector circuit for opens, shorts, or excessive resistance and sets this code when the pulse width or current draw falls outside the expected range for the commanded injection event.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or misfire sensation, especially when the engine is cold or under light load
Hesitation or stumble during acceleration due to a lean or rich condition on cylinder 3
Reduced fuel economy as the PCM may default to a rich or limp mode strategy
Possible shaking or vibration felt through the steering wheel or seat at idle
In some cases, the engine may enter limp mode with reduced power output

Common causes, most likely first

Faulty fuel injector on cylinder 3 with high internal resistance or a stuck pintle
Damaged or corroded wiring harness connector at the cylinder 3 injector
Open or shorted injector driver circuit in the engine wiring harness
Failed injector driver inside the PCM (less common but possible)
Poor electrical ground connection shared by the injector circuit
Contamination or debris in the fuel rail affecting injector performance
Aftermarket or incorrect injector installed on cylinder 3 with mismatched specifications

How to diagnose and fix it

Perform a visual inspection of the cylinder 3 injector connector and wiring for corrosion, chafing, or loose pins
Measure the resistance of the cylinder 3 injector with a multimeter and compare it to the manufacturer's specification
Use a noid light or oscilloscope to verify that the PCM is sending a proper pulse signal to the injector
Check for continuity and short-to-ground on the injector control circuit between the PCM and the injector
Swap the cylinder 3 injector with a known-good injector from another cylinder to see if the misfire moves
Inspect the fuel rail for pressure and contamination, and test fuel pressure if other injectors are affected
If all electrical and fuel checks pass, suspect a faulty PCM driver and perform a pinpoint test before replacement

What a cylinder 3 injector code really tells you

A P2B02 can be set by a momentary glitch in the injector circuit that does not repeat, so always check for pending or history codes before condemning parts.
Many technicians replace the injector only to find the real problem is a chafed wire in the harness near the intake manifold or a corroded ground point.
The PCM may set this code without ever illuminating the check engine light if the fault is intermittent and does not affect emissions on that drive cycle.
A weak ignition coil or spark plug on cylinder 3 can cause a misfire that mimics an injector fault, so always perform a cylinder balance test before replacing the injector.
Aftermarket injectors with incorrect flow rates or resistance values are a common cause of repeat P2B02 codes on vehicles that have had prior engine work.

Can I keep driving with P2B02?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration or towing because a lean cylinder can overheat and damage the catalytic converter or piston. If the engine is misfiring severely or flashing the check engine light, stop driving and have it towed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.